Beckhoff CX-B510 Series, Руководство пользователя

Страница: 27 / 81

Connection and cabling
CXxxxx-M510/B510 27 Version: 1.0
Drop lines
Drop lines must always be avoided as far as possible, since they inevitably cause reflections. The reflections
caused by drop lines are not however usually critical, provided they have decayed fully before the sampling
time. In the case of the bit timing settings selected in the Bus Couplers it can be assumed that this is the
case, provided the following drop line lengths are not exceeded:
Baud rate Drop line length Total length of all drop lines
1 Mbit/s < 1m < 5 m
500 kbit/s < 5 m < 25 m
250 kbit/s < 10 m < 50 m
125 kbit/s < 20 m < 100 m
50 kbit/s < 50 m < 250 m
Drop lines must not have terminating resistors.
Star Hub (Multiport Tap)